Clamping device or jig.



H. YARDLEY.

GLAMING DEVICE 0B. IG. APPLIOATIQN FILED DBO. l2, 1912.

Patented July' 1:, 1913.

` INVENTOR WITNESSCS UNITED .sf-raras E aErENT oEEICE.

HARRY YAEDEEX, o r GLoUCEsTEE c1ITY, `NEW JERSEY, ,AssrGNoE To wELsEaCn LIGHT COMPANY, 0E GLOUCESTER CITY, NEW JERSEY, .A Conroaairmmor NEW JERSEY.

CLAMPING DEvIoE on HG.

Specification of LettersTatent.

hpplioation'ledecember 12,1812. Serial No..736,382.

To all 'whom 'it may econcern.'

Be it known that I, Hanni IYARDLEY, a citizen of the United States, residing at Gloucester City, Camden county, New Jersey, have invented a new and useful Improvement in Clamping Devices or Jigs, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- A l `igure l Vis a side view o-f a clamping device orjig embodying my invention; Fig. 2 is an inverted plan -view of the same, partly in section; and Figs. 3 and -t-are perspective views of two ofthe members of the device.

lVly,inventionhas relation to clamping dc.- vices, more especially adapted for use in connection with jigsg'and designed to provide a simple device of this character in which the work piece, or other part to be held, can be qiiicklyfset and clamped in position.

The nature of my invention will he best .understood hy reference to the accompany- .'ing drawings, in which I vhave sliown'o'nc embodiment thereof, and which wilil now be described, it being premised, however, that various changes may be made `in the details of construction and arrangement. of the parts without departing from the spirit and scope of the, invention as defined in the appended clainiS: l

In the drawings, the numeral 2 designates u the body of a jig, which is of inverted U- form to provide opposite abutment po-rtions'hetween which the 'wrlc piece indicated at 3 is held.4 One of these abutments is formed with suitable means, such as the stud 4, for centering said piece. Rigidly secured in the other leg or abutment is a sleeve member 5,- which is formed with opposite longitudinal slots 6 extending into its inner end. The inner end of this sleeve member is also formed adjacent to one edge of each slot 6 with a segmental forwardly projecting lug 7 Y 8 is a sleeve nut, having at' its forward end the diametrically opposite lugs or projections 9, which are adaptedy to slide in the slots 6.

10 is a clamping screw whose thread engages the interior thread 11 of the nut 8. This clamping screw has a lholding point 12 at its inner end, and is shown as provided `with a large .milled actuating .handle :mem- .ber 13.

14 isa spring which is interposed between thehandle member and the outer end of the sleeve nut.8. When the lugs 9 are in line with the slots 6, the screw 10 and nut 8 can be moved freely longitudinally in the sleeve member 5. This enables the point 12 ofthe screw to bequickly moved in against the end of the work piece. Then, by a slightro-tary movement, the lugs 9 will engage the stop ends 15 of the projection 7, thereby locking the sleeve nut from further rotation, and the further turning movement of the handle 13 will cause said screw to turn on its threaded bearing in 'the nut 8. The engagement of the lug 7 with the end surfaces-1G of the sleeve member holds the screw and sleeve against backward movement.

My invention provides a clamping device o f extremely simple and convenient character, in which the work piece or other object'to be clamped can be quickly set and secured, since only a partial turning of the screw is required to set the clamp. In the ordinary common screw clamp four or five complete turns of the screw are usually necessary. In the present device, the pieces can be located and clamped in the jig with less than a quarter of aturn of the screw,

the exact amount depending on the shape of the part which the screwclamps against.

It will be obvious that my improved clamp can be applied to a variety of different forms of and holding devices.

I claim l1. A clamping device comprising a nut member, having an interior thread, a clamping'screw engaging the thread, and a bearing member, the nut and bearing in embers having coperating slots and projections whereby the nut and screw may be moved freely through the bearing member, or the nut member may be locked thereto by pressure of the clamping screw'against the work; substantially as described.

2. A clamping device, Clamping screw, a nut member .threaded on the screw and having projections, and a bearing member formed with slots toreceive the projections, and having stop projections comprising a projections of the nut member; substantially as described.

3. A clamping device of the character described, comprising a clamping screw, a nut member threaded on thescrew, and a bearing member within which the nut member is freely movable longitudinally, the nut and bearing -members having portions whereby they may be locked to each other 10 by a slight rotary movement of the nut tially as described.

In testimony whereof I have hereunto set my hand.

HARRY YARDLEY,

Witnesses:

J. H. JOHNSON, EDGAR LENTON.' 

